k viall



Dec. 11, 1934. K. WALL 1,983,887

RECORDING MECHANISM FOR TRUCK MIXERS AND THE LIKE @60199K //l'a ll,

Dec. 11,1934. G, K WALL 1,983,887

yRECORDING MEGHANISM FOR TRUCK MIXERS AND THE LIKE Fild March l2, 1932 4 Sheets-Sheet 2 G, K. VIALL Dec. 1l, 1934.

RECORDING MECHANISM FOR TRUCK MIXERS AND THE LIKE Filed March 12, 1932 4 Sheets-Sheet 3 gwoemtoz A @W961i ma,

G. K. \/|Al L 1,983,887

RECORDING MECHANISM FOR TRUCK MIXERS AND THE LIKE Dec. 11, 1934.

Filed 'March l2, 1952 4 Sheets-Sheet 4 :IlllllllllllllIl-IlllIIIIIIMIIIIISIIIIIIIIIIII m n M Patented Dec. 11, 1934 PATENT OFFICE RECORDING MECHANISM FOR TRUCK MIXERS AND THE LIKE George K. Viall, Milwaukee, Wis., assignor to Chain Belt Company, poration of Wisconsin Application March 12,

17 Claims.

This invention relates to mechanism for pro-. ducing a graphic record ofthe operations of various machines, such for example as concrete mixers, and more particularly mixers of the truck or transit type, and has for one of its objects to provide an apparatus of this character which will be simple in construction, comparatively inexpensive to manufacture and more efficient in use than those which have been heretofore proposed.

While it has been common practice heretofore in connection with concrete mixers and other similar apparatus to provide what are known as batchmeters for timing the mixing and other operations, and in some instances these batchmeters have had associated with them recording mechanism for producing graphic records of the operations of the machine, there are certain reasons well understood by those skilled in the art why such batchmeters and recorders are not wholly satisfactory for use in connection with truck or transit mixers.

The development of the truck or transit mixer, particularly those of the rotating drum type, has been along two general lines, in the first of which the power for rotating the mixing receptacle has been derived from the truck motor, while in the second, such power has been furnished by an independent motor mounted upon the truck chassis. In the case of mixers other than truck mixers the motor and mixing receptacle usually revolve at a substantially xed speed and because of this the batchmeters employed therewith commonly determine the mixing period by the measurement of elapsed time from the beginning of the mixing operation.` In the case of truck mixers, however, where the mixing operation is or may be carried ony during transit, if the power for driving the mixing receptacle is derived from the truck motor it is obvious the speed of rotation of the receptacle will vary directly as the speed of such motor varies, due to traffic conditions, and that therefore the elapsed time measurement of the mixing operation is not as desirable as it is in the case of mixers of other types. Even where an independent motor is employed upon a truck mixer for furnishing power to the mixing receptacle, the speed thereof may vary, and in View of such conditions in truck mixer practice it is desirable that the measurement of the mixing operation be upon the basis of the total number of revolutions of the receptacle rather than on the basis of elapsed time.

State and municipal regulations and specifications layfdown certain requirements for the mixing of concrete both in stationary and in truck Milwaukee, Wis., a cor- 1932, Serial No. .598,481

mixers, which requirements are well known to those skilled in the art. Among these requirements are those relating to the manner and amount of mixing necessary to produce the concrete. Frequently disputes arise between the inspectors and the truck operators or the contractor as to the amount of mixing which has been given to one or more particular batches, and in order to obviate such mis-understanding it is highly desirable to provide an automatic mechanism for producing a graphic record of the various functions of the truck mixer, such as the total number of revolutions of the receptacle, the rate at which such revolutions were made, the time at which the water was introduced and the duration of such introduction, and the time and duration of the opening of the discharge closure.

The present invention has for its principal object to provide a simple and effective apparatus which will produce such records and while, because of its construction it is particularly adapted for use with truck mixers in which the speed at which the mixing receptacle is driven may vary widely, at the same time it is equally adapted for use with other types of mixing and other apparatus which may be driven at a varying or constant rate of speed.

With the above and other objects in view which will appear as the description proceeds, the invention consists in the novel details of construction and combinations of parts more fully hereinafter described and particularly pointed out in the appended claims.

Referring to the accompanying drawings forming a part of this specification in which like reference characters designate like parts in all the views:-

Figure l is a front elevational view of one form of recording mechanism constructed in accordance with the present invention;

Figure 2 is a side elevational view of the mechanism shown in Figure l, as seen from the right of the latter figure, a portion of the casing being broken away to show certain of the operating members;

Figure 3 is a view similar to Figure l but with the face plate and parts carried thereby removed to show the interior construction;

Figure 4 is a vertical sectional View taken apf proximately on the plane indicated by the line 4-4 of Figure 3, looking in the direction of the arrows;

Figure 5 is a side elevational view of a well known form of truck mixer unit showing the recording mechanism constituting the present invention in place thereon;

Figure 6 is an end elevational view of the parts shown in Figure 5;

Figure 7 is a detail sectional elevational View, on an enlarged scale, taken approximately on the plane indicated by the line 7,-7 of Figure 6, showing a portion of the mechanism for actuating the stylus which produces the record of the movements of the discharge door;

Figure 8 is an enlarged sectional View through a portion of the casing showing the recording styluses and portions of the operating connections whereby one of them is actuated in response .to the opening and closing of the discharge door;

Figure 9 is a fragmentary detail sectional View, partly in elevation, showing a portion of the mechanism for setting the recorder;

Figure 10 is a vertical sectional View taken approximately on the plane indicated by the line 10-10 of Figure 9; and

Figure l1 is an elevational view of a typical chart or graph produced by the apparatus.

Referring more particularly to Figures 1 to 4 inclusive, it will be seen that the mechanism is for the most part enclosed within a casing or housing 15 which comprises a front or face plate member 16 and a back plate 17. These two members are spaced apart, with the space between them being bridged by a relatively thin band 18, and these parts may be maintained in assembled relation by suitable screws and bolts 19 passing through the face plate 16 and into the rear plate 17, as will be readily understood.

The back plate 17 is provided with a bearing 20 in which is journalled a drive shaft 21, the outer end of which carries a driving sprocket or gear 22 and the inner end of which has rigidly secured to it an operating cam or eccentric-23. A stud 24 carried by the back plate 17 above the driving shaft 21 is provided with an eccentric inner portion 25 upon which is journalled for oscillation an operating arm 26. This arm carries a roller 27 rotatably mounted thereon and bearing against the surface of the cam or eccentric 23, as will be clear from Figs. 2 and so that rotation of the eccentric 23 in eithend'lifection will produce oscillation of the arm 26 upon its pivot 25.

The arm 26 also has pivotally secured to it as at 28 a pawl 29 having a toe 30 which engages with the teeth 31 of a ratchet wheel 32 which is rotatably journalled upon a shaft or stud 33 carried by and projecting inwardly from the rear plate 17. At one point in the circumference of the wheel 32 one or more teeth are omitted, producing a dwell 34, the purpose of which will appear more fully below. The operating arm 26 is provided with an extension 35 to which is connected one end of a coiled spring 36, the other end of which is anchored to a pin or stud 37 carried by the rear plate 17, and which spring exerts force to always maintain the roller 27 in contact with the surface of the eccentric 23, as will be readily understood.

The pawl 29 is provided with a pin or stud 40 adjacent its toe 30 to which is connected one end of a spring 4l, the other end of which is anchored to a pin 42 also carried by the rear plate 17, the said spring yieldingly maintaining the pawl in operative engagement with the teeth 3l of the ratchet wheel 32.

From what has been thus far disclosed it will be apparent that rotation of the driving shaft 21 through the medium of the gear or sprocket 22 will produce rotation of the cam or eccentric 23, which through the roller 27 will cause Oscillation of the operating arm 26 about its pivot 25. Such oscillation of arm 26, through the dog or pawl 29 will produce a step by step movement of the ratchet wheel 32 in the well known manner, which movement will continue until the toe 30 of pawl 29 reaches the dwell 34, whereupon the wheel 32 will stop since the movement of the pawl is insufhcient to bridge the space caused by the missing teeth. It thus results that when the device is once set into operation the wheel 32 will make a substantially complete revolution and then stop until it is reset in a manner which will be more fully described below.

The power for driving the shaft 21 is or may be derived from the transmission shaft which imparts movement to the mixing receptacle. Referring now more particularly to Figs. 5 and 6, in which the present mechanism is illustrated as being applied to a well-known form of truck mixer having a rotatable mixing receptacle 45 and an independent motor enclosed Within a housing 46, which drives the said drum through a suitable transmission 47, suchh transmission is provided with a shaft 48, provided with a sprocket and chain drive 49, the chain of which passes about the sprocket 22carried by driving shaft 21 of the recorder. It therefore results that whenever the drum 45 is being rotated from the transmisproducing oscillation of the operating arm 26, the number of such oscillations being in direct ratio to the number of rotations of the receptacle, and the actual ratio of which may be determined and fixed by the relative sizes of the driving and driven sprockets. This ratio may be 1 to l or any other suitable ratio, as will be readily understood, but in any event a counting of the number of oscillations of the arm 26 will give an accurate indication of the number of revolutions made by the drum 45.

For the purposes of recording the oscillations of the arm 26 with this end in view, the face plate 16 has hinged to it as at 50 a closure 51 which may be provided with a key-operated or other lock 52 for maintaining it in closed position against unauthorized opening, and which closure member carries a suitable clock-work mechanism 53 for driving a shaft or spindle 54, at a fixed uniform rate of speed. The said spindle 54 carries a plate or disk 55 which receives and holds a removable chart member 56 of paper or other material, which is adapted to be rotated with the carrying member 55 by means of a driving and positioning pin 57, which is receivable in hole 58 provided in the chart. The driving mechanism may be arranged to move the chart at any desired rate of speed, as for example at the rate of one revolution p'er ysion mechanism 47, the shaft 21 will be rotated,

hour, and the chart disk 56 may be provided with apparent from what has just been described that oscillations of the arm 26 will produce corresponding oscillations of the bracket 60, arm 61 and stylus 62, causing the latter to produce a zigzag line upon the chart disk 56 substantially as shown at 63 in Figure 11. If the drum is being rotated Cai at a relatively fast speed, causing relatively rapid oscillations of the arm 26, since the chart disk 56 is moved by a uniform rate of speed, the record produced will be in the form of'closely spaced zigzags as indicated at 64, whereas if the speed of the drum is reduced the peaks of the recorded line will be further apart as indicated at 65. Assuming that the chait 56 is graduated for one revolution per hour, each space thereon would represent one minute and by counting the number of peaks between adjacent lines it is a simple matter to determine the rate of speed at which the drum has been rotated at any particular time. In the typical chart illustrated in Figure 11 assuming a 1 to 1 ratio, the record line 63 shows that the drum was rotated at a speed of ap- K proximately 6 R. P. M. during the first six minutes of the operation, after which its speed was reduced to approximately 21/2 revolutions per minute. Since the oscillation of the arm 26 will continue so long as the drum is rotated the number of peaks in the record produced by the stylus 62 will represent the total number of revolutions of the drum.

It is also desirable in the operation of mixers of this character to have a record of the mixing revolutions performed by the drum, as distinguished from additional ones made thereafter to prevent segregation of the mixture, and for this purpose there is provided within the housing a lever 66, see Fig. 3, which is pivoted as at 6'7 to the back plate. 'I'his lever is provided with a pair of toes 68 which are spaced apart a distance greater than the length of the dwell 34 in the ratchet wheel 32, and which toes 68 normally engage the teeth 31 of this ratchet wheel as shown, being retained in such engagement by means of a spring 69 associated with the lever 66. The said lever has secured to it an arm 70 which carries a stylus or recording member r71 similar to the stylus 62 and engageable with the chart disk 56 when the parts are in the operative position shown in Figure 4. As the ratchet wheel 32 is revolved in the manner above described the movement of its teeth 31 will through the toes 68 produce oscillation of the lever 66 thereby producing a zigzag record such as '72 upon the chart. This zigzag record will of course only be produced so long as the wheel 32 is moving, and when the dwell 34 comes beneath the toe 30 of pawl 29 to stop the wheel, the oscillation of the lever 66 will likewise cease and the remainder of this particular record will be an arcuate line such as '73.

As above stated it is also desirable to secure a graphic record of the time of admission of the water to the drum, and also of the opening of the discharge door. For the purpose of recording the opening and closing of the discharge door there is provided a stylus or recorder 75 carried by arm '76 pivoted as at '7'7 to a bracket '78, see Figs. 3 and 8. The arm 76 is connected by a spring or other yieldable connection 79 to a shaft or plunger 80 freely slidable in a mounting 81 and connected to a flexible shafting or cable 83 which is enclosed within a flexible tube or housing 84 and which extends from the rear plate 17 backwardly to the rear of the mixing receptacle 45, as shown in Figures and 6. At this point the cable 83 is connected to plunger 85 slidably mounted in a bracket housing 86 secured to a transverse beam or support 8'7 of the truck mixer frame, and the said plunger 85 bears upon a cam 88 rigidly secured to the operating shaft 89, by means of which the discharge door 90 is opened and closed, as is common practice in this type of mixer. The cam 88 is provided with a low portion 91 in which the plunger 85 rests when the discharge door is in closed position, but when the shaft 89 is oscillated to open the door 90 the cam 88 is likewise rotated to push the plunger 85 upwardly, as viewed in Figure '7, thereby imparting longitudinal movement to the flexible cable or shaft 83 which in turn transmits it through the spring '79 to the arm '76 to cause the stylus '75 to be brought into engagement with the surface of the chart disk 56. It thus results that when the discharge door is opened the stylus r75 will be caused to produce a record in the form of an arcuate line 92 upon -the chart 56, see Fig. 11. On the other hand when the discharge door is closed and the plunger 85 rests in the low portion of the cam 88 the resilient connection '79 withdraws the stylus 75 from contact with the chart and no line appears on the chart.

A cam similar to 88 is also mounted upon the stern or shaft 93 of the valve which controls the admission of water from the water tank 94 to the drum 45, which cam has associated with it, a plunger similar to the plunger 85 which is connected through a flexible shafting 95 and a flexible connection similar to spring 79 to an arm 96 which carries a stylus 97, see Figures 3, 4 and 8. The operation of this recording mechanism is identical with that just described in connection with the discharge door so that when the operating or control handle 99 of the water valve is moved to open the valve the cam and plunger associated with the shaft 93 transmit motion through the flexible shafting 95 to the arm 96l and cause the stylus 9'7 to engage with the chart 56 ,td produce a record in the form of an arcuate line 100, indicating the time the water valveis open.

As above stated the ratchet wheel 32 has one or more teeth omitted at one point in its periphery to provide a dwell 34 the purpose of which is to stop the movement of the wheel 32 after it has made a complete revolution. In order to set the recorder for a second operation the wheel 32 must be moved a sufficient distance to bring the toe 30 of pawl 29 into engagement with the first tooth after the break or dwell 34 andfor this purposethe following mechanism is provided.

As best shown in Figures 9 and 10 the ratchet wheel 32 is provided with a lug 101 upon the rear face thereof, which lug is adapted to be engaged by the toe 102 of a dog 103. This dog is pivotally carried by arm 104 and is provided with cam portion 105 against which bears a spring 106 which yieldably maintains the toe 102 in engagement with the rear surface of the wheel 32 but which of course permits the dog 103 to slide past the lug 101 when moved downwardly as seen in Figures 9 and 10.

The arm 104 is carried by shaft 107 journalled in the rear plate 1'7 and extending to the exterior thereof where it is provided with an arm 108 rigidly secured thereto, to which is pivotally connected as at 109 an actuating rod 110. This rod extends forwardly, see Figures 1 and 2, passing through a guiding lug 111 formed upon the front plate 16 and the extreme forward end of the rod 110 is adapted to be engaged by the lug 112 formed integrally with the member 51. A spring 113,

see Figures 9 and 10, extends from the pivot pin 114 of the dog 103, to the anchor pin 42, and ex- ,erts a force normally tending to move the dog 103 downward, and the arm 104 in a counterclockwise direction as viewed in Figure 10. This spring therefore tends to swing the actuating arm 108 in a counter-clockwise direction as viewed in Figure 2 and to move the starting rod toward the left as viewed in said gure. It thus results that whenever the member 51 is unlocked and swung downwardly for the purpose of placing a new chart in position at the central loading yard, the rod 110 willbe moved toward the left as seen in Figure 2 and the dog 103 will be moved downwardly from the position shown in Figure 10 until its toe 102 engages beneath the lug 101 of the ratchet wheel 32. When the member 51 is again swung to closed position after the placing of the new chart upon the carrying member 55, the lug 112 will be brought into contact with the left hand end of rod '110, forcing it toward the right as viewed in Figure 2 and, through the arm 108, and shaft 107, moving the arm 104 in a clockwise direction, as viewed in Figure 10, to raise the dog 103 and, through its engagement with lug 101, to move the ratchet wheel 32 a sufficient distance to bring the toe 30 of the pawl 29 into engagement with the rst tooth below the break or dwell 34. The mechanism is thus set or placed in a condition to properly function at such time as the clutch controlling the transmission of power from the independent motor within the housing 46 to the transmission gearing 47 is engaged for the purpose of rotating the mixing receptacle 45.

To guard against an operator substituting a counterfeit card, it is preferred to provide on the cards spaces for the indication of the time the card is placed in the recorder, and the time it is taken out, which indications may be signed or initialed by the inspectors or others in authority, as shown in Figure 11. The times shown on the cards may be compared with records kept by the inspectors or contractors, and accurate check thus maintained.

Inasmuch as the cards are positioned on the plate by the stud or pin 57, which occupies no particular position relative to the styli 62 and 71 at the time of the placing of a new card, the records producedby these styli do not necessarily commence at the zero line on the card. Likewise,

the zigzag records produced by these styli may not start immediately with the closing of door 51, since the said styli are not oscillated except during the actual mixing or agitating cycle, and

in many instances this operation is not started until some time after the truck has left the central plant. Until the mixing is actually started, styli 62 .and 71 will produce only straight lines, as will be readily understood.

Should the operator for any reason open the door 51 of the recorder during a trip, such action will be recorded, since it will move the card out of contact with the styli 62 and 71 causing a break in record lines produced thereby, as indicated at 63' and 72 in Figure 11.

As is customary in instruments of this type, provision is made for sounding an audible signal at the conclusion of the mixing period, which is determined in this instance by the number of revolutions of the drum required to produce one revolution of the ratchet wheel 32. This signalling mechanism may take any suitable form, being here shown as comprising a signal bell 115 adapted to be sounded by movement of a rod or plunger 116 which in turn is actuated by a lever 117 pivoted as at 118 to the back plate 17 and carrying a stud or roller 19 which is adapted to be engaged by a cam plate 120. carried by the ratchet wheel 32, see Figures 3 and 4.

As is also customary in mechanism of this class, there may be provided a counting device 121, see Figure 4, for indicating the total number of batches which are handled by the machine. This mechanism, to which no claim is made, may be actuated in any suitable manner, as for example by means of the resilient connection 122 between the lever 117 and the actuating arm 123 of the counter. f

It is obvious that those skilled in the art may vary the details of construction as well as the precise arrangement of parts without departing from the spirit of the invention, and therefore it is not wished to be limited to the above disclosure except as may be required lby the claims.

What I claim is:

1. In mechanism for recording mechanical operations, a movable serrated element; means for moving said element simultaneously with and in direct relation to the performance of the operation to be recorded; and a member engageable with and operable by the serrations of said element, provided with means for producing on a chart a record of the movements of said serrated element.

2. In mechanism for recording the operations of a machine, a toothed wheel; means for moving said Wheel in synchronism with the operation to be recorded; a chart-carrying member; means for driving said member; and a member movable to and fro by said wheel, provided with means for producing on a chart carried by said carrying member a Zig-zag record of the movement of said wheel, corresponding to the performance of said operation.

3. In mechanism for recording the operations of a machine, a ratchet wheel; means including a pawl for imparting step-by-step movement to said wheel corresponding to the perforance of the operations to be recorded; and a lever engageable with and operable by the teeth of said wheel, provided with means for producing on a chart a zig-zag record of the movement of said wheel, corresponding to the performance of said operations. v

4. In mechanism for recording the operations of a machine, a serrated element; means for moving said element throughout the performance of a predetermined number of the operations to be recorded and in synchronism therewith; anda member, provided with a recording means, engageable with and operable by the serrations of said element to cause said recording means to produce on a moving chart a zig-Zag record during the movement of said serrated element, and an unwavering record when movement of said element is arrested.

5. In mechanism for recording the operations of a machine, a toothed wheel; means for causing said wheel to be rotated a predetermined distance during the performance of a predetermined number of the operations to be recorded and in synchronism therewith, and then stop; and a member, provided with a recording means, operable by the teeth of said Wheel as it moves to cause said recording means to produce on a moving chart a zig-zag record during said movement.

6. In mechanism for recording the operations of a machine, a ratchet wheel having certain of its teeth omitted to provide a dwell; means including a pawl engageable with the teeth of said wheel to impart movement to said wheel until said dwell is reached, said movement continuing during the perfomance of a predetermined number of the operations to be recorded and in synchronism therewith; and a member, provided with a recording means, operable by the teeth of said wheel as it moves to cause said recording means to produce on a moving chart a zigzag record during such movement, said recording means producing an unwavering record when the pawl reaches the dwell and movement of the wheel is arrested.

7. In recording apparatus for truck mixers and the like, a member for producing on a chart a graphic record of the perfomance of an operation of the mixer; a movable element for actuating said member; means for moving said element; means for rendering said moving means ineffective after said element has been moved a predetermined distance and means for causing said moving means to again become effective.

B. In recording apparatus for truck mixers and the like, a member for producing on a moving chart a graphic record of the performance of an operation of the mixer; a movable element for actuating said member; means for moving said element; .means for rendering said moving means ineffective after said element has been moved a predetermined distance; and aditional means for moving said element to cause said first named moving means to again become effective.

9. In apparatus for recording the performance of the functions of truck mixers and the like, a member for producing on a chart a graphic record of the mixing cycles of the mixer; a toothed wheel for actuating said member; means engageable with the teeth of said wheel for mov/ ing it a predetermined distance; means for stopping said movement when the wheel has traveled said distance; and additional means for moving said wheel to cause said first named moving means to again become effective.

10. In apparatus for recording the performance of the functions of truck mixers and the like, a member for producing on a chart a graphic record of the mixing cycles of the mixer; a toothed element for actuating said member, certain of the teeth of said element being omitted to provide a dwell; means engageable with the teeth of said element for moving it until said dwell is reached, whereupon the moving means becomes ineffective and the element stops; and additional means for moving said element to cause re-engagement of its teeth with said first named moving means.

1l. In apparatus for recording the performance of the functions of truck mixers and the like, a member for producing on a chart a graphic record of the mixing cycles of the mixer; a ratchet wheel for actuating said member, certain of the teeth of which are omitted to provide a dwell; means including a pawl engageable with the teeth of said wheel for moving it until said dwell is reached, whereupon the pawl becomes ineffective and the wheel stops; and additional means for moving the wheel to remove the dwell from beneath the pawl.

12. In apparatus for recording the performance of the functions of a machine, a housing having a movable portion; a recording member; an actuating member for said recording member; movable throughout a predetermined cycle, and means controlled by the movable portion of said housing for resetting said actuating member to enable it to perform a new cycle.

13. In apparatus for recording the performance of the functions of a'machine, a housing having a closure; a recording member; an actuating member for said recording member; means for moving said actuating member through a cycle corresponding to and in synchronism with a predetermined number of performances of the function to be recorded, means for rendering said moving means ineffective at the conclusion of said cycle; and means controlled by said closure for rendering said moving means again effective, to enable it to move the actuating member through a new cycle.

14. In apparatus for recording the performance of the functions of a machine, a. housing having a closure; a recording member; an actuating member for vsaid recording member; means for moving said actuating member through a cycle corresponding to and in synchronism with a predetermined; number of performances of the function to be recorded; means for rendering said moving means ineffective at the conclusion of said cycle; and means operable by movements of said closure for moving said actuating member to cause said first named moving means to again become effective.

15. In apparatus for recording the performance of the functions of a machine, a housing having a closure; a recording member; a toothed wheel for actuating said recording member, certain of the teeth of said wheel being omitted to provide a dwell; means engageable with the teeth of said wheel for driving it until said dwell is reached, through a cycle corresponding to and in synchronism with a predetermined number of performances of the function to be recorded; and means engageable with the wheel and operable by the movements of said closure, for resetting the wheel for a new cycle, through movement thereof to disengage the dwell from the driving means.

16. In apparatus for recording the performance of the functions of a machine, a housing having a closure; a recording member; a toothed wheel for actuating said recording member, certain of the teeth of said wheel being omitted to provide a dwell; means engageable with the teeth of said wheel for driving it until said dwell is reached, through a cycle corresponding to and in synchronism with a predetermined number of performances of the function to be recorded; a lug on said wheel; and a dog engageable with said lug and operable by the movements of said closure, to shift the wheel to remove the dwell from the driving means.

17. The combination with a receptacle provided with a discharge opening and a movable closure therefor, of a member for producing a record upon a chart; and means operable in synchronism with the opening and closing movements of said closure for causing said recording member to produce said record.

GEORGE K. VIALL. 

